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What is the flow rate? Ion exchange could help, you may need a pilot to confirm. Membrane filtration will work for sure.

A peristaltic dosing pumps system will eliminate all off-gas concerns. I am using peristaltic pumps since 3 years and the only problem is changing the tube once a year(3-4 minutes) but it is cheap comparing to all the problems you may have with diaphragm pumps.

Almost all UV's are equal regarding performance but quality is different from one to another. I like to work with Sterilight products (www.r-can.com). Using UV necessitate a good water quality: Max. level: Fe = .3 ppm, Mn=.05 ppm, hardness=7 gpg, low turbidity, low color and high UV...

Few chemicals are very effective to treat that effluent. There is few options I suggest: AquaPerl by Atlas environmental products (819-565-9688) and obtained >98% Zn reduction with that. Global Ionix system: www.globalionix.com Moonstone RSA: www.moonstoneinc.ca Good luck!

Magnetic device will not help. Depending the pH, flow rate and iron level and form. You may use filters like birm, catalox, KDF-85, greensand plus (combined with chlorine injection or KMnO4) or ion exchange.

What is the flow rate? Do you have an analysis of that wastewater? What is the temperature?

You may also install a sedimentation tank and pump the supernatant back to filters. Oxidized Mn is easily settleable. And then only purge the sediment to a bag filter.

If you are not allowed to discharge any liquid concentrate you will have to use filtration and bag filtration is the cheapest solution I know. Instead of using GAC cartridges, I suggest Carbon block cartridges, they have an higher filtration capacity.

Instead of non-proven electronic device, I suggest Filtersorb SP. It is an efficient no salt system than can remove hardness EFFECT. See that article for another similar product. Those products have been validated by well recognized...